Granite Cobble
Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)
igneous
Category
Metamorphic Rock (Specifically A Rock Composed Of Minerals)
Browse metamorphic rock (specifically a rock composed of minerals) specimens identified by the Rock Identifier community.
Quartzite
Quartzite (SiO2)
metamorphic
Vesicular Basalt (Scoria)
Basalt (Extrusive Igneous Rock)
igneous
Agate
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Ferruginous Sandstone
Sandstone with Iron Oxide (Limonite/Goethite)
sedimentary
Sandstone (likely Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Porphyritic Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Red Jasper (Brecciated Jasper)
SiO2 (Silicon Dioxide) with Ferric Iron inclusions
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)
Igneous
Ruby (Corundum)
Al2O3 (Aluminium oxide with Chromium impurities)
Mineral
Jasper in Basalt Matrix
Silicon Dioxide (SiO2) with impurities; Chalcedony
sedimentary (secondary mineral) within igneous
Quartz pebble
Silicon dioxide (SiO2)
mineral
Granite
Granite (compositionally: Quartz, Feldspar, Mica)
igneous
Granodiorite
Granodiorite (Na,Ca)(Si,Al)4O8
igneous
Scoria (Vesicular Basalt)
Scoria (Extrusive Igneous Rock)
igneous
Granite Thin Section
Granitic rock (Phaneritic texture)
igneous
Kimberlite
Kimberlite
igneous
Red Quartzite
Quartzite (primarily SiO2)
metamorphic
Blue Sapphire
Corundum (Al2O3 with trace amounts of iron and titanium)
mineral
Diorite (River Cobble)
Intermediate plutonic igneous rock
igneous
Diabase (Dolerite) Cobble
Diabase / Dolerite
igneous
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Sandstone (Greywacke/Lithic Sandstone)
Arenite / Lithic Sandstone
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Ferruginous Quartz Cobble
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Jasper (specifically a banded or dark variety)
Silicon Dioxide (SiO2) with impurities
sedimentary
Quartzite with Quartz Vein
Quartzite (primarily SiO2)
metamorphic
Chert (specifically Jasper/Brown Chert)
Silicon Dioxide (SiO2)
sedimentary
Granite
Phaneritic Plutonic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Magnetite Orthorthotropic Rock
Magnetite (Fe3O4)
mineral
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Jasper / Chert
Silicon Dioxide (SiO2) with Goethite or Limonite inclusions
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz (Common Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt with Secondary Infilling (e.g., Agate, Quartz, or Zeolite)
igneous